private async Task FilterBy(ICollectionView <object> collectionView, string query)
{
var itemType = collectionView.GetItemType();
var queryParts = TreatSpacesAsAndOperator ? query.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries) : new string[] { query };
FilterExpression filterExpression = null;
foreach (var queryPart in queryParts)
{
var filterExpressions = new List <FilterExpression>();
foreach (var property in CollectionView.GetItemType().GetTypeInfo().DeclaredProperties)
{
try
{
var propType = property.PropertyType;
if (propType == typeof(string) ||
IsNumeric(propType) && MatchNumbers)
{
filterExpressions.Add(new FilterUnaryExpression(property.Name, FilterOperation.Contains, queryPart));
}
}
catch { }
}
var fe = FilterExpression.Combine(FilterCombination.Or, filterExpressions.ToArray());
if (filterExpression == null)
{
filterExpression = fe;
}
else
{
filterExpression = new FilterBinaryExpression(FilterCombination.And, filterExpression, fe);
}
}
await(collectionView as ISupportFiltering).FilterAsync(filterExpression);
}